Public ownership evidence

NewAmsterdam Pharma Company N.V. Ordinary Shares (NAMS) Ownership Disclosures

Read NAMS insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

Separate the three disclosure sources

Step 1 of 3

Recent Form 4 activity

NewAmsterdam Pharma Company N.V. Ordinary Shares: source evidence dated 2026-10-10T12:08:28.848Z.

Available
2026-10-02
Trade date
2026-09-30
Reporting owners
Kastelein Johannes Jacob Pieter
Code
S
Shares
50,246
Reported value
Not reported
What you should see

The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.

Step 2 of 3

Is this an insider transaction, 13F holding, or Congressional event?

Each source has different dates and units. Raw ticker-matched receipts, including amendments, are not deduplicated current ownership totals.

SEC 0001193125-26-412431
What you should see

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Step 3 of 3

Read NAMS fundamentals

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Read NAMS fundamentals
What you should see

Keep reporting dates and units beside the answer, and inspect its original citations.

Recent Form 4 activity

See the complete recent form 4 activity

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2026-10-022026-09-30Kastelein Johannes Jacob PieterS50,246Not reported
2026-09-152026-09-14Davidson Michael H.P10,000Not reported
2026-09-092026-09-04Smither John WS1,600Not reported
2026-09-042026-09-01Gunning Robert WilliamA3,200Not reported
2026-09-042026-09-01Gunning Robert WilliamA14,000Not reported
2026-08-262026-08-24Kastelein Johannes Jacob PieterS125,000Not reported
2026-07-232026-07-20Kooij Louise FrederikaS2,915Not reported
2026-07-232026-07-20Kooij Louise FrederikaS31,885Not reported
2026-07-232026-07-20Kooij Louise FrederikaS70,200Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2567,418$2,284,796None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-252,284,796$67,418,000None
Palo Alto Investors LP2026-06-302026-08-2044,359$1,503,327None
Palo Alto Investors LP2026-06-302026-08-1944,359$1,503,327None
Ensign Peak Advisors, Inc2026-03-312026-08-19249,190$7,976,572None
Ensign Peak Advisors, Inc2025-12-312026-08-19549,511$19,276,846None
Palo Alto Investors LP2026-06-302026-08-1844,359$1,503,327None
Jefferies Financial Group Inc.2026-06-302026-08-18600,000$20,334,000Put
Jefferies Financial Group Inc.2026-06-302026-08-18122,728$4,159,252None
Ishara Investments LP2026-06-302026-08-1536,900$1,250,541None
SEI INVESTMENTS CO2026-06-302026-08-1540,503$1,372,647None
SEI INVESTMENTS CO2026-06-302026-08-15365$12,370None
Federation des caisses Desjardins du Quebec2026-06-302026-08-151,785$60,494None
First Turn Management, LLC2026-06-302026-08-15582,497$19,740,823None
Basecamp Wealth Advisors LLC2026-06-302026-08-1599$3,355None
Quarry LP2026-06-302026-08-154,544$153,996None
ADAR1 Capital Management, LLC2026-06-302026-08-15118,623$4,020,133None
Artia Global Partners LP2026-06-302026-08-15503,936$17,078,391None
Frazier Life Sciences Management, L.P.2026-06-302026-08-1518,088,902$613,032,889None
XTX Topco Ltd2026-06-302026-08-15145,008$4,914,321None
ExodusPoint Capital Management, LP2026-06-302026-08-15304,334$10,313,879None
Qube Research & Technologies Ltd2026-06-302026-08-1547,090$1,595,880None
Caption Management, LLC2026-06-302026-08-1592,200$3,124,658Put
Caption Management, LLC2026-06-302026-08-1518,700$633,743Call
Eversept Partners, LP2026-06-302026-08-15275,471$9,335,712None
OSAIC HOLDINGS, INC.2026-06-302026-08-15139$4,710None
Schonfeld Strategic Advisors LLC2026-06-302026-08-1589,765$3,042,135None
Orbis Allan Gray Ltd2026-06-302026-08-151,741,754$59,028,043None
Orbis Allan Gray Ltd2026-06-302026-08-155,873$199,036None
Squarepoint Ops LLC2026-06-302026-08-1592,026$3,118,761None
Man Group plc2026-06-302026-08-1580,832$2,739,396None
Engineers Gate Manager LP2026-06-302026-08-1519,529$661,838None
JANE STREET GROUP, LLC2026-06-302026-08-15474,182$16,070,028None
JANE STREET GROUP, LLC2026-06-302026-08-1554$1,830None
JANE STREET GROUP, LLC2026-06-302026-08-157,300$247,397Put
JANE STREET GROUP, LLC2026-06-302026-08-1512,000$406,680Call
Cormorant Asset Management, LP2026-06-302026-08-15500,000$16,945,000None
LMR Partners LLP2026-06-302026-08-15214,500$7,269,405Put
LMR Partners LLP2026-06-302026-08-1534,100$1,155,649Call
BOOTHBAY FUND MANAGEMENT, LLC2026-06-302026-08-15121,200$4,107,468Put
BOOTHBAY FUND MANAGEMENT, LLC2026-06-302026-08-1535,756$1,211,771None
Duquesne Family Office LLC2026-06-302026-08-153,070,146$104,047,000None
Legal & General Group Plc2026-06-302026-08-1527,904$945,668None
Legal & General Group Plc2026-06-302026-08-1511,439$387,668None
HRT FINANCIAL LP2026-06-302026-08-15349,843$11,856,000None
Ensign Peak Advisors, Inc2026-06-302026-08-15212,423$7,199,015None
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-15148,000$5,015,720Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-15568,600$19,269,854Put
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-15754,327$25,564,142None
STEMPOINT CAPITAL LP2026-06-302026-08-1577,589$2,629,491None

90-day public filing window, up to 50 source positions.

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗Palo Alto Investors LP ↗Palo Alto Investors LP ↗Ensign Peak Advisors, Inc ↗Ensign Peak Advisors, Inc ↗Palo Alto Investors LP ↗Jefferies Financial Group Inc. ↗Jefferies Financial Group Inc. ↗Ishara Investments LP ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.

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